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SARS-CoV-2 structure. (a) Molecular architecture of SARS-CoV-2 virus obtained by cryoelectron tomography and subtomogram averaging. The S protein in “RBD down” conformation, “one RBD up” conformation, lipid envelope, and ribonucleoproteins (RNPs) are shown in salmon, red, gray, and yellow, respectively [160]. (b) The cryoelectron microscopy structure of RBD-ACE2 complex [162].
